## Algebra and Trigonometry 10th Edition

$(-\infty,4]$
We are given the function: $f(x)=4-x$ Graph the function. The solution of the inequality $f(x)\geq 0$ consists of the values of $x$ for which the graph of the function is above the $x$-axis. Determine the zero of the function: $4-x=0\Rightarrow x=4$ The solution of the inequality is: $(-\infty,4]$